Andrew stewart



(No Model.)

A. 82 J. STEWART 8L J. WOTHERSPOON.

Draw Bench and Carriage.

No. 234,211. Patented Nov. 9,1880.

Mew W2 NVPETERS. PHOTO-LITHOGRIPHER, WASHINGTON D C.

UNITED STATES PATENT @FFICE.

ANDREW STEWART, JAMES STEWART, AND JOHN IVOTHERSPOON, OF COATBRIDGE, NORTH BRITAIN.

DRAW-BENCH AND CARRIAGE.

SPECIFICATION forming part of Letters Patent No. 234,211, dated November 9, 1880.

Application filed May 28, 1880.

T 0 all whom it may concern Be it known that we, ANDREW STEWART and JAMES STEWART, both of the firm of Andrew & James Stewart, of Ooatbridge, in the county ofLanark, North Britain, and JOHN WOTHERSPOON, of same place, manager to the said firm, have invented Improvements in Draw-Benches and Carriages for the manufacture of iron and other drawn tubes, and improvements in manufacturing the said tubes, the said improvements being applicable for the manufacture of skelps and non-welded tubes, of which the following is a specification.

According to our invention a draw-bench and the carriage which moves thereon are constructed as follows:

Our improvement consists, first, in combining with the carriage and draw-bench a steamcylinder having a piston whose rod projects through both covers and connects with sliding frames carrying pulleys and the carriage by means of suitable chains or ropes, as hereinafter described.

Our improvement consists, further, in combinin g a regulator for said operating device, consisting of a cylinder for containing liquid having a similar piston and rod whose ends connect, by chains or ropes, with the sliding frames, as hereinafter described.

Our improvement consists, further, in a construction of carriage adapted to our improved bench.

Figure 1 of the accompanying drawings represents in side elevation, and Fig. 2 in sectional plan, our improved draw-bench as arranged for being actuated by steam.

We place a cylinder, A, of any convenient length, under the draw-bench B, the said cylinder A being provided with a piston and a piston-rod, a, projecting through the cylindercovers at each end. To each end of the pistonrod we attach a frame, 0, sliding in guides c, and carrying pulleys 0 whose number, in ac cordance with the length of the draw-bench, is sufficient to multiply the short stroke of the piston, so that it can produce the travel of the carriage D over the full length of the bench.

The carriage D runs upon the draw-bench B by means of wheels (1 d, as seen in Fig. 3, (which represents a transverse section of the (N0 model.) Patented in England October 6, 1879.

said bench B,) and to an enlarged scale in Fig. 4. The upper part of the bench is connected with its lower part by a web, I), which is situated to one side of the center of the said bench, in order to accommodate the horn d with which the carriage D is provided. This horn d projects, as is shown, from the side of the carriage inward to the center thereof, and is for the attachment of the chain by which the traversing motion is given to the carriage D. The upper surface of the bench is formed with a V or equivalently-shaped groove, b for facilitating the manipulation of the tube in the course of its manufacture. The standards B of the draw-bench, at each end thereof, carry pulleys b and a chain, E, is fastened at one end to the horn d on the carriage, then passed over the pulleys b and 0 as shown in Fig. 1,and fastened at its other end to the standard of the bench. Similarly another chain, E, is also attached at one end to the horn d and passed over the pulleys b and c and fastened to the standard at the other end of the bench. By this means the movement of the piston-rod a is caused to give the requisite length of movement to the carriage D.

For the purpose of regulating and controlling the speed of the carriage we place parallel to, or in other suitable position relatively with, the steam-cylinder A a speed-regulator, (shown in Figs. 2 and 3,)consisting of acylinder, G, filled with water or oil or other liquid. This cylinder G is furnished with a piston and with a piston-rod, g, projecting from both ends. Two pipes, open communication with the cylinder G on each side of the piston thereof, and alternately with the upper and under sides of the valve A chain, H, is connected at one end to the piston-rod g, and, passing over a pulley, h, mounted in the standard at one end of the draw-bench, is attached at its other end to the sliding frame 0, as shown in Fig. 2. Another chain, H, passing over a pulley, h, also connects the other end of the piston-rod g with the other sliding frame, 0, at

the opposite end of the draw-bench.

Adjustable valves g are provided at each end of the pipes g of the cylinder G, to regulate the openings for the passage of liquid from one end of the cylinder to the other, so that in eq w "57 proportion to the extent of the openings so adjusted the speed of the steam-piston will be regulated by the rate at which the liquid flows through the valves, and by this means the carriage I) may be traversed quickly in returning the tube to the furnace and slowly in the other direction.

The slide-valves A of the cylinder A are arranged to be operated for starting the mechanism by means of a hand-lever, a. At each end of the cylinder A are tappets I upon shafts i, which are connected by rods 1' with the starting-lever a. The said tappets Iare in such position that at the end of the stroke of the piston of the cylinder A in either direction one or other of the sliding frames 0 comes into contact with one or otherof the said tappels I, and accordingly moves the valves to out 01f steam from the cylinder A and stop the traverse of the carriage 1) until steam is again admitted by moving the lever a farther to the right or left, so as to open the admission-port. This may be efl'ected by so arranging the valves that they cut off steam when in mid-position, and arranging the tappets 1 so that the frames 0 move them to this position. The remainder f h traverse of the said valves in either (if r mi t admit steam to either side of the i t fo tr versing the carriage D in one or the di ti is eti'ected by means of the hand-lever a In Operating with this improved bench we, b 1 ]dtl whole length of the tube at the one operation, and to do this we tlrst weld a rod or porter on one end of the hoop or on the skelp. but by preference on the hoop, a notch being made in the porter to hol 1L i the carriage, and when the hoop is heated the rod or porter is attached to the carriage and drawn through the bending-die. The piston is then reversed,thereby running the tube into the furnace, (the front of which is represented by the line X in Fig. 1,) and a second and following dies are passed over the rod and the tube drawn through again until it is of the proper size and finish.

When using our invention for the production of skelps or non-welded tubes these are either drawn through the bending-die only, or, ifdrawn through the second and following dies, they are not heated to the welding temperature.

It will be understood that although we have described our invention in connection with a furnace. yet it may be employed in the manufactu re of tubes, such as brass or copper tubes, which are not heated before being drawn.

Having now described and particularly ascertained the nature of our said invention, and the system, mode, or manner in or under which the same is or may be used or practically carried into effect, we would observe, in conclusion, that what we consider to be novel and original, and therefore claim as our invention, is-

l. The combination, with a carriage, 1), and a draw-bench, B, of a cylinder. A, provided with a piston-rod, a, projecting through both covers, sliding frames 0 (J, carrying pulleys c c c and chains E E, connecting the sliding frames with the carriage, as set forth.

2. The cylinder G, having piston-rod 9 proyecting through both ends thereof, chains II ANDRE\V STEWART. JAMES STEWART. L. S. JOHN WOTHERSPOON. 1L. 8.]

Witnesses ROBERT ADAM GUNN, JAMES SMITH BEGG, Both of 115 St. Vincent Street, Glasgow. 

